feat(task-management): enhance task management UI with subtask functionality

- Added localization support for task management messages in multiple languages, including Albanian, German, English, Spanish, and Portuguese.
- Implemented subtask addition feature in the `TaskRow` component, allowing users to create and manage subtasks directly within the task interface.
- Introduced hover effects and improved styling for task rows to enhance user experience and interaction.
- Updated task indicators to display counts for subtasks, comments, and attachments, providing better visibility of task details.

worklenz-frontend/public/locales/de/task-management.json

@@ -1,5 +1,15 @@
 {
   "noTasksInGroup": "Keine Aufgaben in dieser Gruppe",
   "noTasksInGroupDescription": "Fügen Sie eine Aufgabe hinzu, um zu beginnen",
-  "addFirstTask": "Fügen Sie Ihre erste Aufgabe hinzu"
+  "addFirstTask": "Fügen Sie Ihre erste Aufgabe hinzu",
+  "openTask": "Öffnen",
+  "subtask": "Unteraufgabe",
+  "subtasks": "Unteraufgaben",
+  "comment": "Kommentar",
+  "comments": "Kommentare",
+  "attachment": "Anhang",
+  "attachments": "Anhänge",
+  "enterSubtaskName": "Unteraufgabenname eingeben...",
+  "add": "Hinzufügen",
+  "cancel": "Abbrechen"
 }